Read this response and predict the preceding dialog. The accurate modelling of embankment dams is difficult due to their mix of rocks and soil and little work had been carried out previously on their reaction to dynamic loading, such as was exerted by earthquakes.

2-way dialog:
Speaker A) What did Severn do on earthquakes?.
Speaker B) Severn continued his focus on the effects of earthquakes upon dams, particularly embankment dams which were widespread in the hydro-electric power stations being constructed during this period and outnumbered the previously dominant arch dams by ten to one in new construction..
Speaker A) Did he model the dams?.
Speaker B) 